Display devices using led backlight units and led packages for the backlight units

Abstract

A display device is disclosed. The display device includes: a liquid crystal panel including color filters; and a backlight unit including a light guide plate arranged in rear of the liquid crystal panel and a bar-type LED module arranged at one side of the light guide plate to supply backlight to the one side of the light guide plate. The bar-type LED module includes: a substrate elongated along the one side of the light guide plate; a plurality of LED packages arrayed on the substrate and each including a first LED emitting first white light and a second LED emitting second white light and separated from the first LED by a partition wall; a first wiring connecting the first LEDs of the plurality of LED packages in series; a second wiring connecting the second LEDs of the plurality of LED packages in series; and a control unit controlling the ratio of a current applied to the first LEDs and a current applied to the second LEDs to adjust the color coordinates of backlight produced by the first white light and the second white light. The control unit adjusts the color coordinates of the backlight along a straight line connecting the color coordinates of the first white light and the color coordinates of the second white light.

What is claimed is: 
     
         1 . A display device comprising: a liquid crystal panel comprising color filters; and a backlight unit comprising a light guide plate arranged in rear of the liquid crystal panel and a bar-type LED module arranged at one side of the light guide plate to supply backlight to the one side of the light guide plate, wherein the bar-type LED module comprises: a substrate elongated along the one side of the light guide plate; a plurality of LED packages arrayed on the substrate and each comprising a first LED emitting first white light and a second LED emitting second white light and separated from the first LED by a partition wall; a first wiring connecting the first LEDs of the plurality of LED packages in series; a second wiring connecting the second LEDs of the plurality of LED packages in series; and a control unit controlling the ratio of a current applied to the first LEDs and a current applied to the second LEDs to adjust the color coordinates of backlight produced by the first white light and the second white light, and wherein the control unit adjusts the color coordinates of the backlight along a straight line connecting the color coordinates of the first white light and the color coordinates of the second white light. 
     
     
         2 . The display device according to  claim 1 , wherein the X and Y values of the color coordinates of the second white light are greater than those of the color coordinates of the first white light. 
     
     
         3 . The display device according to  claim 1 , wherein the color coordinates of the first white light are (0.207<X<0.257, 0.160<Y<0.210) and the color coordinates of the second white light are (0.316<X<0.366, 0.313<Y<0363). 
     
     
         4 . The display device according to  claim 1 , wherein each of the LED packages comprises a first cavity and a second cavity separated by the partition wall, the first LED is constructed by a combination of a first LED chip and a first phosphor located in the first cavity, and the second LED is constructed by a combination of a second LED chip and a second phosphor located in the second cavity. 
     
     
         5 . The display device according to  claim 4 , wherein the first LED chips and the second LED chips are blue LED chips, the first phosphor is a yellow phosphor, and the second phosphor is a mixture of a yellow phosphor and an orange phosphor. 
     
     
         6 . A display device comprising: a liquid crystal panel comprising color filters; and a backlight unit comprising a light guide plate arranged in rear of the liquid crystal panel and a bar-type LED module arranged at one side of the light guide plate to supply backlight to the one side of the light guide plate, wherein the bar-type LED module comprises: a substrate elongated along the one side of the light guide plate; a plurality of first packages arrayed on the substrate and emitting first white light; a plurality of second packages arrayed alternately with the first packages on the substrate and emitting second white light; a first wiring connecting the first packages in series; a second wiring connecting the second packages in series; and a control unit controlling the ratio of a current applied to the first packages and a current applied to the second packages to adjust the color coordinates of backlight produced by the first white light and the second white light, and wherein the control unit adjusts the color coordinates of the backlight along a straight line connecting the color coordinates of the first white light and the color coordinates of the second white light. 
     
     
         7 . The display device according to  claim 6 , wherein the color filters secondarily adjust the color coordinates of the light that have been primarily adjusted by the backlight unit. 
     
     
         8 . The display device according to  claim 6 , wherein the X and Y values of the color coordinates of the second white light are greater than those of the color coordinates of the first white light. 
     
     
         9 . The display device according to  claim 6 , wherein the color coordinates of the first white light are (0.207<X<0.257, 0.160<Y<0.210) and the color coordinates of the second white light are (0.316<X<0.366, 0.313<Y<0363). 
     
     
         10 . The display device according to  claim 6 , wherein when the control unit adjusts the color coordinates of the backlight, the first packages and the second packages are always turned on. 
     
     
         11 . A display device comprising: a liquid crystal panel comprising color filters; and a backlight unit comprising a light guide plate arranged in rear of the liquid crystal panel and a bar-type LED module arranged at one side of the light guide plate to supply backlight to the one side of the light guide plate, wherein the display device comprises: a wavelength converting sheet arranged between the bar-type LED module and the liquid crystal panel; a substrate elongated along the one side of the light guide plate; a plurality of LED packages arrayed on the substrate and each comprising a first LED cooperating with the wavelength converting sheet to emit first white light and a second LED cooperating with the wavelength converting sheet to emit second white light and separated from the first LED by a partition wall; a first wiring connecting the first LEDs of the plurality of LED packages in series; a second wiring connecting the second LEDs of the plurality of LED packages in series; and a control unit controlling the ratio of a current applied to the first LEDs and a current applied to the second LEDs to adjust the color coordinates of backlight produced by the first white light and the second white light, and wherein the color coordinates of the backlight are adjusted along a straight line connecting the color coordinates of the first white light and the color coordinates of the second white light. 
     
     
         12 . The display device according to  claim 11 , wherein the color filters secondarily adjust the color coordinates of the light that have been primarily adjusted by the backlight unit. 
     
     
         13 . The display device according to  claim 11 , wherein the X and Y values of the color coordinates of the second white light are greater than those of the color coordinates of the first white light. 
     
     
         14 . The display device according to  claim 11 , wherein the first LEDs are blue LEDs and the second LEDs are white LEDs. 
     
     
         15 . The display device according to  claim 11 , wherein the wavelength converting sheet comprises quantum dots. 
     
     
         16 . A display device comprising: a liquid crystal panel comprising color filters; and a backlight unit comprising a light guide plate arranged in rear of the liquid crystal panel and a bar-type LED module arranged at one side of the light guide plate to supply backlight to the one side of the light guide plate, wherein the display device comprises: a wavelength converting sheet arranged between the bar-type LED module and the liquid crystal panel; a substrate elongated along the one side of the light guide plate; a plurality of first packages arrayed on the substrate and cooperating with the wavelength converting sheet to emit first white light; a plurality of second packages arrayed alternately with the first packages on the substrate and cooperating with the wavelength converting sheet to emit second white light; a first wiring connecting the first packages in series; a second wiring connecting the second packages in series; and a control unit controlling the ratio of a current applied to the first packages and a current applied to the second packages to adjust the color coordinates of backlight produced by the first white light and the second white light, and wherein the color coordinates of the backlight are adjusted along a straight line connecting the color coordinates of the first white light and the color coordinates of the second white light. 
     
     
         17 . The display device according to  claim 16 , wherein the color filters secondarily adjust the color coordinates of the light that have been primarily adjusted by the backlight unit. 
     
     
         18 . The display device according to  claim 16 , wherein the first packages are blue LEDs and the second packages are white LEDs. 
     
     
         19 . The display device according to  claim 16 , wherein the wavelength converting sheet comprises quantum dots. 
     
     
         20 . The display device according to  claim 16 , wherein the color coordinates of the first white light are (0.207<X<0.257, 0.160<Y<0.210) and the color coordinates of the second white light are (0.316<X<0.366, 0.313<Y<0363).